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Hayashi, Takahashi,Ajima, Kaori 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.2 No.e3
Chemical processing of $Nb_2O_5$coated $BaTiO_3$-composite particles was investigated with surface modification through hydrolysis of niobium ethoxide on the surface of $BaTiO_3$ particles. It was clarified from BET measurement, SEM&TEM observations and Zeta-potential that origineal $BaTiO_3$ particles were homogeneously coated or modified with niobium hydroxide particles. $Nb_2O_5(1wt%)$-coated $BaTiO_3$ bodies sintered at 1250-$1257^{\circ}C$ exhibited a rather flat temperature characteristic with dielectric constants of 2200-3000 and $tan{\delta}\; of\;{\leqq}1%$. The microstructure on $Nb_2O_5$-coated $BaTiO_3$ sintered bodies consisted of grains of several ${\mu}m which are much smaller than those of $BatiO_3$ sintered bodies, suggesting that the grain growth of $BaTiO_3$ was suppressed by Nb205 particles existing existing at the grain boundaries.